Fuse cartridge



J. B. GLOWACKI. FUSE CARTRIDGE. APPLICATION FILED JULY2I, 19:9.

' 1,435, 155, Patented Nov. 14, 1922.

Patented Nov. 14, 1922.

UNITED STATES JOHN B. GLOWACKI, OF CHICAGO, ILLINOIS.

FUSE CARTRIDGE.

Application filed July 21,

To all whom it may concern:

Be it known that I, JOHN B. GDOWACKI, a subject of the Republic of Poland, having declared my intention to become a citizen of the United States, and a resident of the city of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in a Fuse Cartridge; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, and to the numerals ofreference marked thereon, which form a part of this specification.

This invention relates to fuses, more particularly those employing a cartridge, containing a strip of readily fusible material.

Heretofore in fuses'of this type the replacement of the fuse link in the cartridge has been a difficult and an awkward operation. The principal object, therefore, of the present invention is to provide a simple, inexpensive fuse cartridge from which the fuse link maybe readily removed and replaced without the use of tools.

Other and further important objects of this invention will be apparent from the disclosures in the specification and drawings.

The invention (in a preferred form) is illustrated in the drawings and hereinafter more fully described.

On the drawings:

Figure 1 is a side elevation of a fuse and support therefor embodying the features f the present invention.

Figure 2 is an end view. of the same.

Figure 3 is a longitudinal vertical section through the fuse cartridge with parts in elevation.

Figure at is a section through the fuse carried on the line 4-4 of Figure 3.

Figure 5 is a plan view of the fuse link.

Figure 6 is a section on the line 6 -6 of Figure 4.

Figure 7 is a section on the line 7-7 of Figure 3.

Figure 8 is a section on the line 8-8 of Figure 3, with parts removed.

Figure 9 is a side View of oneof the knife blade contacts.

As shown in the drawings:

The fuse cartridge 1 is of the knife blade type supported by pairs of sprin contacts 2 mounted on a suitable base 3. ese con- 1919. Serial No. 312,343.

tacts may be connected to the sourceof current in any desired manner.

The construction of the cartridge 1 is shown more particularly in Figure 3. A tube 4, preferably of insulating material such as fibre or other suitable material, convenientl forms the body of the cartridge case. 0 one end of this tube a centrally apertured cap 5 is secured by any suitable means, such as rivets 6. At the other end of the tube a ferrule 7 is mounted. The outer end of this ferrule is reduced'in diameterso that a ring or centrally apertured. cap 8 may have threaded engagement therewith.

Knife blade contacts 9 and 10 are attached to ends of the cartridge respectively in any suitable way. For this purpose lugs 11 areformed in the end of the blade 9 for insertion through corresponding apertures in the cap '5 and in a washer 12, arranged against the inner face of the cap., These lugs are subsequently riveted or clenched to hold the blade 9, cap 5 and washer 12 securely together.

The other blade 10 is similarly attached to a disc 13, which may be provided with an outwardly extending flange 14 for engagement with a corresponding inwardly directed flange on the threaded ring or cap 8,

so that by rotating the latter the disc may be pressed inwardly to secure electrical contact with a fuse carrier 15 within the tube 1. As the blade 10 is not rigidly connected to the ring or cap 8, it may always be maintained in alignment with the other blade 9, and if desired or necessary the blade 10 may be rotated to bring it into alignment with the other blade 9 after the ring 8 has been tightened up, the frictional contact between the ring Sand the disc 13to whlch the blade 10 is connected serving to hold them in position.

The body of the fuse carrier may conveniently be formed of a tube 16 of insulating material, such as fibre, to the ends ofwhich are attached metallic caps 17. On the ends of these caps are provided projecticns 18, adapted to extend through the central apertures in the cap 5 and disc 13, and having Washers 19 adapted to bear against the inner faces of the latter. It will be noted that the inner ends of the knife blades 9 and 10 are recessed at 26 to receive the ends of the projections 18.

To ensure good electrical contact between the washers l9 and the cap 5 and disc 13, the distance between the outer faces of these washers is slightly greater than that between the inner faces of the cap 5 and disc 13 when the ring 8 is screwed home so that the desired pressure against the ends of the carrier may be obtained by rotating the ring 8.

Along one side of the tube 16 is arranged a suitable fuse link 20, with its ends clai'uped to the caps 1'? by means of split rings 21.

While any suitable form of fuse link may be .sed, I prefer to employ one having a series of sections 22 of reduced width, as shown in Figure 5. In the tube 16, grooves 23 are provided adapted to register with the sections 22 of the fuse link and thereby provide ample air space therearound. In the form of fuse link shown apertures 24 and 25 are provided so that the fuse link may be used with. other types of fuse can riers in which the fuse link is held in place by cap screws or the like.

The operation is as follows:

To replace a fuse link the cartridge 1 is first pulled out of engagement with the contacts 2 and the ring 8 screwed off. The disc 13 and its attached blade 10 can now be removed and the fuse carrier 15 pulled. out. Next the split rings 21 are slipped off the ends of the carrier and a new fuse link laid along the tube 16 with its sections 22 of reduced width in register with the grooves 28 in the tube 16. then replaced and the fuse assembled and replaced for use in a similar manner. As the fuse carrier is formed with both ends of identical construction it may be inserted in the cartridge either end first.

I am aware that numerous details of construction. may be varied through a wide range without departing from the principles of this invention, and I therefore do not purpose limiting the patent granted otherwise than necessitated by the prior art and the annexed claims.

I claim as my invention:

l. A fuse device comprising a tube of in sulating material, a fuse carrier within the tube, metallic end pieces on said carrier, disks mounted on said end pieces, acap sepured to one end of the tube, said caphavmg a central opening and apertures, one on either side of said opening, a knife blade, lugs on said knife blade extending through said apertures and having riveted connec-- tion with one of said disks, a cap mounted on the other end of the tube, and means for adjusting said cap longitudinally of the tube to clamp the disks and fuse carrierwithin the tube and the ensure electrical contact between the end pieces andthe disks. 2. fuse device comprising a tube of in-- sulatlng material, a fuse carrier within the The rings 21 are tube, shouldered metallic end pieces on said carrier, caps, one on each end of the tube, disks, one lining each cap, each cap and their having a central. opening through which the corresponding end'piece of the carrier projects, one of said caps having apertures, one on either side of said opening, a knife blade, lugs on saidknife blade extending through said apertures and having riveted connec tions to the corresponding disk, the other of said caps comprising a ferrule and aring threaded on said ferrule, said ring having" a flange extending over the remaining disk and surrounding the central opening of said cap, a second knife blade, two lugs thereon, said lugs extending through said opening and having a riveted connection to said lastnamed disk, whereby said ring is adjustable lon itudinally of the tube to clamp the fuse carrier between the caps and to ensure electrical contact between the end pieces and said disks.

3. A. fuse device comprising a tube of insulating material, a cap secured to one end of said tube, and a ferrule secured to the other end, said cap having a central opening, a ring having threaded engagement with said ferrule, a fuse carrier within the tube, disks at each end of the fuse carrier, retained within the tube by the cap and ring respectively, each of the disks having a central opening, shouldered metallic end pieces on the carrier extending through the said openings and having their shoulders in engagement with the inner faces of said disks, knife blades each having a. pair of lugs, apertures in said cap and disks, one on either side of each opening through which said lugs extend for riveted connection to said disks.

4. A. fuse device comprising a tube of insulating material, a centrally apertured cap secured to one end of the tube, a metallic ferrule secured to the other end of the tube, a ring having threaded engagement with said ferrule, a fusecarrier within the tube comprising a cylinder of insulatingmaterial, caps at each. end of the cylinder, and means for clamping the ends of a fuse strip to said cap, said cap having projections in line with said cylinder, disks between said carrier and said cap and ring respectively, each disk having a central opening, said projections extending through said openings, knife blades, lugs on said knife blades, and apertures in said cap and disks to accommodate said lugs for riveted connection of the knife blades to the disks.

5. A fuse devicii comprising a tube of insulating material, a circumferentially grooved cylinder of insulating material therein, and a fuse strip held therebetween, said fuse strip having reduced portions corresponding with the grooves in the cylinder.

6. A fuse device comprising a tube of insulating material having a cap on each end, a circumferentially grooved cylinder of insulating material therein, and a fuse strip held therebetween, said fuse strip having reduced portions corresponding with the grooves in the cylinder, one of the caps being adjustable, whereby good electrical contact is ensured.

7. A renewable fuse comprising an insulating tube, an insulating cylindrical core therein, said core being rovided with circumferential grooves, an a replaceable fusible link held in position between the core and the tube, said link having reduced portions which register with the grooves in the core, whereby a free passage of air is afiorded to the reduced portions of the fuse.

In testimony whereof I have hereunto subscribed my name in the presence of two subscribing witnesses.

JOHN B. GLOWACKI.

Witnesses:

' CHARLES W. HILLS, Jr.,

EARL M. HARDINE. 

